Which product are you using? PDF.js Express Viewer PDF.js Express Version 8.7,4 Detailed description of issue Fonts not displaying on PDF. They work everywhere else, just not in PDFJs or the demo webviewer. Failed to load font ‘g_d1_f9’: ‘SyntaxError: Invalid font data in ArrayBuffer.’. Expe…

Hello dale, Can you provide the document for us to test with? Best regards, Tyler

redacted_problem_pdf.pdf (52.9 KB)

Hello dale, The file loads correctly for me for both WebViewer and PDFJS Express, Can you provide some additional steps to reproduce the issue? including any environment details such as OS and Browser? Best regards, Tyler

Here are the two versions - One in Apyse with correctly loaded fonts and one in PDFJS Webviewer Demo [image] [image] [image]

Done using Windows 11, and both latest Chrome/Edge.

@tgordon What were you doing to get it to load correctly? It doesnt even load correctly in the PDFJS website..

Hello dale, Im using a Mac with Chrome, which I think might be the difference. Unfortunately we are no longer updating our version of the PDFJS renderer, therefore we suggest you look at our sister product WebViewer that has our own in-house renderer: Free Trial: JavaScript PDF Viewer | Apryse doc…

Following this up with a potential solution and your recommendations for how to implement. [image] How to disable font face via API? Technical Support Continuing on from this problem here, we found that disabling the font face in the compiled code actually let…

Failed to load font 'g_d1_f9': 'SyntaxError: Invalid font data in ArrayBuffer.'

Technical Support

dale September 11, 2025, 7:15am 12

Following this up with a potential solution and your recommendations for how to implement.

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Failed to load font 'g_d1_f9': 'SyntaxError: Invalid font data in ArrayBuffer.'

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